Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541022h&link_type=abstract
American Astronomical Society, AAS Meeting #215, #410.22; Bulletin of the American Astronomical Society, Vol. 42, p.238
Astronomy and Astrophysics
Astronomy
Scientific paper
Local environment plays a primary role in determining the evolution of a galaxy's gas and stellar content. Groups of galaxies, in particular, may be the dominant environment in determining galaxy evolution: e.g. the combination of close encounters and major mergers may stimulate star formation and AGN activity, and may be responsible for "pre-processing" of galaxies as they fall into clusters. We combine the HI observations of galaxy groups in the Coma-Abell 1367 Supercluster from a 2 degree wide strip of the ALFALFA survey centered at +27d from 11h to 13h56m, with pointed Halpha observations from the WIYN 0.9 m. The presence of HI is a measure of the star formation potential of a galaxy, and its spatial distribution reveals the history of recent and on-going interactions between galaxies and with their local environment, while Halpha observations reveal the presence current star formation activity. The groups we observe, determined from 2MASS, span a range of global environments from highest density sub-clumps falling into the center of the cluster, to groups that make up the filaments between clusters, to poor groups that exist on the edges of voids. We present the HI mass function and global star formation rates for the galaxy groups in an attempt to understand the role of environment in driving galaxy evolution.
ALFALFA Team
Giovanelli Riccardo
Haynes Martha P.
Hess Kelley M.
Wilcots Eric M.
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